[MRCA] RS-1 GRC-109 Signal Suck Out Solution

[Rob Flory]

I think having the B plus on the antenna end puts it at a lower impedance
point and therefore can use a smaller choke.  That might be important in
such a small rig.

RF


On Mon, Nov 23, 2015 at 3:27 PM, Tim <timsamm at gmail.com> wrote:

> Hi Breck - yep, that's the solution.  Thanks for the great
> description/photo documentation.
> You put the Heathkit assembly instruction writers to shame!  LOL
>
> One thing that has puzzled me about these transmitters is the designers
> fed HV B+ to the *antenna* end of the pi network coil rather than the
> tube end.  This puts HVDC on the coil and PA band switch, plus the usual
> RF.  I wonder why they did that....pretty unusual.
> 73, Tim
> N6CC
>
> On Mon, Nov 23, 2015 at 8:09 AM, B. Smith <smithab11 at comcast.net> wrote:
>
>>        Several years ago I got tired of using a separate antenna for
>> receive on my GRC-109. A SPDT relay was installed that is keyed via a
>> isolation diode and is powered by the filament line.  The antenna relay
>> solved the "suck out" problem and provides fairly decent QSK. A readily
>> available SPDT Philmore relay is used.  I've  loaded some photos and
>> instructions.
>> Happy Thanksgiving to all.
>> http://k4che.com/GRC109Rel/GRC109rel.htm
>>
>> Z
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